CN102484425A - Pfc converter - Google Patents
Pfc converter Download PDFInfo
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- CN102484425A CN102484425A CN2010800402071A CN201080040207A CN102484425A CN 102484425 A CN102484425 A CN 102484425A CN 2010800402071 A CN2010800402071 A CN 2010800402071A CN 201080040207 A CN201080040207 A CN 201080040207A CN 102484425 A CN102484425 A CN 102484425A
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- 230000001939 inductive effect Effects 0.000 claims description 47
- 238000009499 grossing Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 abstract description 12
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/0085—Partially controlled bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
A PFC converter that prevents and reduces switching losses by controlling ripple of inductor current and enables application for high power usage, includes a switching device that is turned off when an inductor current flowing through an inductor reaches a first threshold value, and turned on when the inductor current reaches a second threshold value. A switching control circuit sets a reference value of the inductor current using results from an input voltage detection circuit and an output voltage detection circuit. The first threshold value is produced by adding a predetermined value to the reference value, and the second threshold value is produced by subtracting the predetermined value from the reference value.
Description
Technical field
The present invention relates to PFC transducer a kind of, that be used to improve power factor as the AC-DC transducer of input ac power output dc voltage.
Background technology
For with commercial ac power source as the input power supply general switching power unit; Owing to commercial ac power source is being carried out after thereby rectification smoothly converts direct voltage into; By the DC-DC transducer it is carried out switch control, so input current becomes discontinuous and will depart from sine wave far away.In order to prevent the caused fault of consequent higher harmonic current,, carry out the higher harmonic current restriction of the power supply of electronic equipment being classified according to purposes and input power etc. on Japan or Europe and other places.
For to limiting, in the power supply of electronic equipment, add the circuit that is called as PFC (power factor correction circuit) transducer, working hard aspect the inhibition higher harmonic current.Utilize Fig. 1 of patent documentation 1 that general PFC transducer is described.
Via low pass filter FIL input, RF1 becomes pulsating voltage to the input power supply through full-wave rectifying circuit from commercial AC power Vi.This pulsating voltage is transfused to the chopper circuit that is made up of inductor L1, switch element Q1, rectifier smoothing circuit of back level, and this rectifier smoothing circuit is made up of diode D1 and smmothing capacitor C1.The switch element Q1 that constitutes chopper circuit becomes and mode as the waveform of the waveform similarity of the Vi of input voltage according to the waveform of input current Iir, just becomes synchronous sinuous mode, carries out the control of conducting, shutoff.
Control circuit is that zero circuit B, current detector F, voltage detector G, multiplier H, comparator E, pulse generator C, drive circuit D constitutes by error amplifier A, detection inductive current.
Become the output of multiplier H corresponding to the value after the output multiplication of the output of the error amplifier A of the voltage of smmothing capacitor C1 and voltage detector G.When the output valve of current detector F surpasses the output valve of this multiplier H, by drive circuit D switch element Q1 is turn-offed via pulse generator C,, the electric current of the inductor L1 that flows through, makes switch element Q1 conducting once more when being zero by testing circuit B output signal.Through moving repeatedly, because voltage detector G is output as sinusoidal wave shape, the peak value of the electric current of the inductor L1 that therefore flows through also becomes sinusoidal wave shape, and the mean value of this electric current also becomes sinusoidal wave shape.Its result improves thereby input current Iir becomes the sinusoidal wave shape power factor, and higher harmonic current is suppressed in below the certain level in addition.This control mode as the electric current critical conduction mode by known.
As control mode except the electric current critical conduction mode, also known continuous current mode.In continuous current mode, switching frequency is fixed, and the mode of following baseline sinusoidal wave according to the mean value of the inductive current of the inductor of flowing through is switched on/turn-offs.
In addition,, in patent documentation 2, disclose following mode, that is: baseline sinusoidal wave has been provided with the higher limit and the lower limit of small amplitude, the conducting/shutoff that comes the control switch element according to the mode that gets into therebetween as other control mode.
Real the opening of patent documentation 1:JP put down 3-70085
Patent documentation 2:JP spy opens flat 7-75329
But, in continuous current mode,, therefore have the bigger problem of loss owing in conducting and turn off process, switching loss takes place.In the electric current critical conduction mode,, therefore there is the problem that is difficult to be applied to high-power purposes because input current is limited in peak value half the of inductive current.In control mode,, therefore be difficult to improve switching loss because the scope of control is restricted to small amplitude as higher limit other control modes, that baseline sinusoidal wave is provided with small amplitude and lower limit.
Summary of the invention
Thereby the object of the present invention is to provide a kind of ripple of controlling inductive current to improve switching loss and then can be applied to the PFC transducer of high-power purposes.
In order to address the above problem, the present invention constitutes as follows.
The PFC transducer of the 1st mode possesses: rectification circuit, and it carries out rectification to the alternating voltage from the alternating current input power supplying input; Series circuit, the next stage that it is connected in said rectification circuit comprises inductor and switch element; Rectifier smoothing circuit, itself and said switch element are connected in parallel; The input voltage detecting unit, it detects from the input voltage of said rectification circuit input; The inductive current detecting unit, it detects the electric current that in said inductor, flows through; The output voltage detecting unit, it detects the output voltage of said rectifier smoothing circuit; And switch control unit; It controls said switch element; Make the mean value of said inductive current become similar shape, constitute and when said inductive current reaches the 1st threshold value, make said switch element shutoff, when said inductive current reaches the 2nd threshold value, make said switch element conducting with respect to said input voltage; In said switch control unit; Set the fiducial value of said inductive current according to the result of said input voltage detecting unit and said output voltage detecting unit, said the 1st threshold value adds setting and generates that said the 2nd threshold value deducts said setting and generates from said fiducial value on said fiducial value.
The PFC transducer of the 2nd mode possesses: the 1st series circuit, and itself and load are connected in parallel, and comprise the 1st switch element and the 1st rectifier cell; Inductor, it is connected between the 1st input of tie point and alternating current input power supplying of said the 1st switch element and said the 1st rectifier cell; The 2nd series circuit, itself and load are connected in parallel, and comprise the 2nd switch element and the 2nd rectifier cell, and the tie point of the 2nd switch element and the 2nd rectifier cell is connected in the 2nd input of said alternating current input power supplying; Smoothing circuit, itself and load are connected in parallel; The input voltage detecting unit, it detects from the input voltage of said alternating current input power supplying input; The output voltage detecting unit, it detects the output voltage of said smoothing circuit; The inductive current detecting unit, it detects the electric current that in said inductor, flows through; And switch control unit; It controls said the 1st switch element and said the 2nd switch element; Make the mean value of said inductive current become similar shape with respect to said input voltage; Constitute said the 1st switch element and said the 2nd switch element are turn-offed; When said inductive current reaches the 2nd threshold value, make said the 1st switch element and said the 2nd switch element conducting, in said switch control unit, set the fiducial value of said inductive current according to the result of said input voltage detecting unit and said output voltage detecting unit; Said the 1st threshold value adds setting and generates that said the 2nd threshold value deducts said setting and generates from said fiducial value on said fiducial value.
In addition, in the PFC transducer of the 1st mode of the present invention and the 2nd mode, change to the Phase synchronization of preferred said setting and input voltage.
In addition, in the PFC transducer of the 1st mode of the present invention and the 2nd mode,, make the on-delay of said switch element preferably in the fiducial value hour of said inductive current just of little when load.
In addition, in the PFC transducer of the 1st mode of the present invention and the 2nd mode, preferably with the conducting of said switch element or turn-off or electric current serves as zero as starting point, through enforcement conducting next time after the stipulated time.
In addition, in the PFC transducer of the 1st mode of the present invention and the 2nd mode, the phase place of preferred said stipulated time according to input voltage changes.
The invention effect
According to the present invention, set the ripple of inductive current arbitrarily according to load, can reduce switching frequency thus.Its result can improve unnecessary switching loss.In addition, can also be applied to high-power purposes.
Description of drawings
Fig. 1 is the circuit block diagram of the PFC transducer among the 1st embodiment of the present invention.
Fig. 2 is the oscillogram of pwm pulse among expression the 1st embodiment of the present invention, that put on switch element, the oscillogram of inductive current, the figure of the 1st and the 2nd threshold value.
Fig. 3 is the circuit block diagram of the PFC transducer among the 2nd embodiment of the present invention.
Fig. 4 is the oscillogram of pwm pulse among expression the 2nd embodiment of the present invention, that put on switch element, the oscillogram of inductive current, the figure of the 1st and the 2nd threshold value.
Fig. 5 is the circuit block diagram of the PFC transducer among the 3rd embodiment of the present invention.
Fig. 6 is the PFC transducer of expression among the 3rd embodiment of the present invention at four figure of the current paths at place regularly.
Symbol description:
The B1 diode bridge circuit
The C1 smmothing capacitor
D1, D2 diode
The Iac input current
The IL inductive current
The L1 inductor
P11, P12 input
P21, P22 output
Q1, Q2 switch element
R1, R2 current detecting are with opposing
The Vac alternating current input power supplying
The Vo output voltage
Vref output voltage desired value
11 input voltage detection circuits
12 output voltage detecting circuits
13 adding elements
15 voltage compensators
17 multipliers
19 threshold setting devices
21,23 comparators
25 triggers
27 AND circuit
29 monostable multi-frequency generators
30 load circuits
35 ON-OFF control circuits
101 PFC transducers
Embodiment
Below, with reference to the embodiment of description of drawings PFC transducer involved in the present invention.
(the 1st embodiment)
Fig. 1 is the circuit block diagram of the PFC transducer of the 1st embodiment.Symbol P11, P12 are the inputs of PFC transducer 101 in Fig. 1, and symbol P21, P22 are the outputs of PFC transducer 101.At the alternating current input power supplying Vac of input P11-P12 input as commercial ac power source, output P21-P22 connects load circuit 30.
In the input section of PFC transducer 101, it is diode bridge circuit B1 that the rectification circuit that alternating voltage to alternating current input power supplying Vac carries out full-wave rectification is set.At the outlet side of this diode bridge circuit B1, connect the series circuit of inductor L1 and switch element Q1.Switch element Q1 be connected in series be used for detecting the electric current that flows through at inductor L1 current detecting with opposing R1.At this switch element Q1 and current detecting two ends, the rectifier smoothing circuit that is connected in parallel and constitutes by diode D1 and smmothing capacitor C1 with the series circuit of opposing R1.Constitute so-called boost chopper circuit by this inductor L1, switch element Q1, diode D1 and smmothing capacitor C1.
Between the two ends of the outlet side of diode bridge circuit B1, input voltage detection circuit 11 is set.In addition, output voltage detecting circuit 12 is set between output P21-P22.
ON-OFF control circuit 35 possesses: relatively the detection signal S2 of output voltage detecting circuit 12 and the multiplier 17 that multiplies each other as the adding element 13 of the Vref of reference voltage, voltage compensator 15, to the output of the detection signal S1 of input voltage detection circuit 11 and voltage compensator 15, threshold setting device 19, relatively current detecting is with comparator 21 and 23, the trigger 25 of the output of the detection signal of opposing R1 and threshold setting device 19.
Output voltage V o that input is obtained by adding element 13 in voltage compensator 15 and the error between the reference voltage V ref.
The the 1st and the 2nd threshold value is input to comparator 21 and 23 respectively, and is compared with opposing R1 detected inductive current by current detecting.When comparator 23 detects the inductive current value when being higher than the 1st threshold value, at the reseting terminal input signal of trigger 25, with stopcock element Q1.In addition, when comparator 21 detects the inductive current value when being lower than the 2nd threshold value,, make switch element Q1 conducting at the set terminal input signal of trigger 25.
Fig. 2 representes oscillogram and the 1st and the 2nd threshold value in half period of alternating current input power supplying of this 1st embodiment, inductive current.Expression is controlled according to the mode of the shutoff of switch element when inductive current is the 1st threshold value, switch element conducting when this external inductive current becomes the 2nd threshold value.
In the half period of the alternating current input power supplying of Fig. 2, the clear specifically setting of how setting.
In the present invention, surpass in the scope of inductance saturation current, become big mode according to ripple and set setting at the ripple (ripple) of inductive current.Its result can reduce the switch number of times.Because switching loss produces, therefore can improve switching loss through reducing the switch number of times when switch element conducting and shutoff.
Can know by Fig. 2, in the half period of alternating current input power supplying,, set setting to such an extent that make ripple become big more greatly, to improve switching loss near the rising of inductive current and near descending.Near the peak value of inductive current, set setting to such an extent that the less ripple that makes diminishes, be controlled so as to be no more than the inductance saturation current.
The Phase synchronization of setting and input voltage ground changes like this, thereby can when considering the inductance saturation current, improve switching loss.
When bearing power changes, set setting as follows.When bearing power diminishes, control with the mode that the inductor average current diminishes.At this moment, it is big that the difference between fiducial value and the inductance saturation current becomes, and can set setting bigger.Near the peak value of inductive current, also can improve switching loss.
When bearing power becomes big, need to increase the inductor average current, if but the size of ripple and bearing power than hour identical, then might surpass the inductance saturation current.At this moment,, can be no more than at the ripple of inductive current in the scope of inductance saturation current and control, therefore can be applied to high-power purposes through setting setting less.
In the action of the 1st embodiment,, therefore become the action that has also improved the EMI noise because switching frequency is not fixed.
In order to come suitably to set setting, as the ON-OFF control circuit 35 preferred DSP (digital signal processor) that adopt according to input voltage or bearing power.
(the 2nd embodiment)
Fig. 3 is the circuit block diagram of the PFC transducer of the 2nd embodiment.Its characteristic is, monostable multi-frequency generator 29 that be provided with in the back level of comparator 21, AND circuit 27 and output single pulse signal.
Input is the pulse during starting point is exported necessarily from the testing result of output signal trigger 25, conducting with this constantly in monostable multi-frequency generator 29.This pulse is input to the AND circuit with the output of comparator 21, during pulse in the conducting next time of switch element be restricted.Thus; When during conducting to conducting next time, being lower than the stipulated time; Make said on-delay next time, at the appointed time through after implement above-mentioned conducting next time, can carry out shown in Figure 4 thisly being provided with the action during discontinuous at inductive current.Its result, the high frequencyization of the switching frequency in the time of can suppressing for example to hang down load.
The starting point of monostable multi-frequency generator 29 output pulses is not limited to the conducting of switch element, also can be to turn-off, in the time of can also being the electric current vanishing of switch element.In addition, the stipulated time that is postponed also can change according to the phase place of input voltage.
(the 3rd embodiment)
Fig. 5 is the circuit block diagram of the PFC transducer of the 3rd embodiment.In addition, Fig. 6 is the figure of four current paths of regularly locating of expression PFC transducer 101.
In Fig. 5, symbol P11, P12 are the inputs of PFC transducer 101, and symbol P21, P22 are the outputs of PFC transducer 101.To the alternating current input power supplying Vac of input P11-P12 input, connect load circuit 20 at output P21-P22 as commercial ac power source.
Load circuit 20 for example is DC-DC transducer and the circuit of accepting the electronic equipment that power supply supplies with through this DC-DC transducer.
Input section at PFC transducer 101 is provided with input voltage detection circuit 11, and inductor L1 therein is connected in series on line.Back level at inductor L1 connects the bridge circuit that is made up of diode D1, D2 and switch element Q1, Q2.Between the source electrode of switch element Q1, Q2 and ground wire, be connected current detecting with opposing R1, R2.Output-parallel at bridge circuit connects the smoothing circuit of being made up of smmothing capacitor C1.
Fig. 6 (A) is switch element Q1, the current path when Q2 is in conducting state in the positive half period of alternating current input power supplying, and Fig. 6 (B) is switch element Q1, the current path when Q2 is in off state in the positive half period of alternating current input power supplying.
In addition; Fig. 6 (C) is switch element Q1, the current path when Q2 is in conducting state in the negative half period of alternating current input power supplying, and Fig. 6 (D) is switch element Q1, the current path when Q2 is in off state in the negative half period of alternating current input power supplying.
In the positive half period of alternating current input power supplying, at Q1, when Q2 is in conducting state, in the path shown in Fig. 6 (A), flow through electric current, in inductor L1, accumulate magnetization energy; At Q1, when Q2 is in off state, in the path shown in Fig. 6 (B), flow through electric current, L1 discharges magnetization energy from inductor.At this moment, the parasitic diode via Q2 flows through electric current.Equally; In the negative half period of alternating current input power supplying; At Q1, when Q2 is in conducting state, in the path shown in Fig. 6 (C), flow through electric current, in inductor L1, accumulate magnetization energy; At Q1, when Q2 is in off state, discharge magnetization energy from inductor L1 in timing place shown in Fig. 6 (D).At this moment, the parasitic diode via Q1 flows through electric current.
Current detecting is provided with in order in the negative half period of positive half period of alternating current input power supplying or alternating current input power supplying, to detect the electric current that in inductor L1, flows through with opposing R2 with opposing R1 and current detecting.ON-OFF control circuit 35 shown in Figure 5 is controlled inductive current according to the method shown in method shown in the 1st embodiment or the 2nd embodiment.
Through controlling under the situation of inductive current with the same method of the 1st embodiment; That kind as shown in Figure 2; By 1st threshold value that inside generated and 2nd threshold value and the inductive current of comparator comparison, thereby respectively Q1 and Q2 are carried out conducting/shutoff control at ON-OFF control circuit 35.
Through controlling under the situation of inductive current with the same method of the 2nd embodiment; That kind as shown in Figure 4; The testing result from the output signal of conducting begin till conducting next time during when being lower than the stipulated time; Make described on-delay next time, thereby implementing said conducting next time through after the stipulated time.
In above the 2nd embodiment and the 3rd embodiment, use DSP (digital signal processor) as ON-OFF control circuit 35, thereby can control easily.
Claims (6)
1. PFC transducer, it possesses:
Rectification circuit, it carries out rectification to the alternating voltage from the alternating current input power supplying input;
Series circuit, the next stage that it is connected in said rectification circuit comprises inductor and switch element;
Rectifier smoothing circuit, itself and said switch element are connected in parallel;
The input voltage detecting unit, it detects from the input voltage of said rectification circuit input;
The inductive current detecting unit, it detects the electric current that in said inductor, flows through;
The output voltage detecting unit, it detects the output voltage of said rectifier smoothing circuit; With
Switch control unit, it controls said switch element, makes the mean value of said inductive current become similar shape with respect to said input voltage,
Constitute and when said inductive current reaches the 1st threshold value, make said switch element shutoff, when said inductive current reaches the 2nd threshold value, make said switch element conducting,
In said switch control unit, set the fiducial value of said inductive current according to the result of said input voltage detecting unit and said output voltage detecting unit,
Said the 1st threshold value adds setting and generates that said the 2nd threshold value deducts said setting and generates from said fiducial value on said fiducial value.
2. PFC transducer, it possesses:
The 1st series circuit, itself and load are connected in parallel, and comprise the 1st switch element and the 1st rectifier cell;
Inductor, it is connected between the 1st input of tie point and alternating current input power supplying of said the 1st switch element and said the 1st rectifier cell;
The 2nd series circuit, itself and load are connected in parallel, and comprise the 2nd switch element and the 2nd rectifier cell, and the tie point of the 2nd switch element and the 2nd rectifier cell is connected in the 2nd input of said alternating current input power supplying;
Smoothing circuit, itself and load are connected in parallel;
The input voltage detecting unit, it detects from the input voltage of said alternating current input power supplying input;
The output voltage detecting unit, it detects the output voltage of said smoothing circuit;
The inductive current detecting unit, it detects the electric current that in said inductor, flows through; With
Switch control unit, it controls said the 1st switch element and said the 2nd switch element, makes the mean value of said inductive current become similar shape with respect to said input voltage,
Constitute and when said inductive current reaches the 1st threshold value, make said the 1st switch element and the shutoff of said the 2nd switch element, when said inductive current reaches the 2nd threshold value, make said the 1st switch element and said the 2nd switch element conducting,
In said switch control unit, set the fiducial value of said inductive current according to the result of said input voltage detecting unit and said output voltage detecting unit,
Said the 1st threshold value adds setting and generates that said the 2nd threshold value deducts said setting and generates from said fiducial value on said fiducial value.
3. PFC transducer according to claim 1 and 2 is characterized in that,
The Phase synchronization ground of said setting and input voltage changes.
4. according to any described PFC transducer of claim 1～3, it is characterized in that,
In the fiducial value hour of said inductive current just of little when load, make the on-delay of said switch element.
5. PFC transducer according to claim 4 is characterized in that,
With the conducting of said switch element or turn-off or electric current serves as zero as starting point, through enforcement conducting next time after the stipulated time.
6. PFC transducer according to claim 5 is characterized in that,
The phase place of said stipulated time according to input voltage changes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-210721 | 2009-09-11 | ||
| JP2009210721 | 2009-09-11 | ||
| PCT/JP2010/063294 WO2011030640A1 (en) | 2009-09-11 | 2010-08-05 | Pfc converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102484425A true CN102484425A (en) | 2012-05-30 |
| CN102484425B CN102484425B (en) | 2014-12-10 |
Family
ID=43732314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080040207.1A Expired - Fee Related CN102484425B (en) | 2009-09-11 | 2010-08-05 | Pfc converter |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8508195B2 (en) |
| JP (1) | JP5316823B2 (en) |
| CN (1) | CN102484425B (en) |
| WO (1) | WO2011030640A1 (en) |
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| CN107333363A (en) * | 2017-08-28 | 2017-11-07 | 北京小米移动软件有限公司 | Reduce the system and light fixture of electromagnetic interference |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20120155132A1 (en) | 2012-06-21 |
| US8508195B2 (en) | 2013-08-13 |
| CN102484425B (en) | 2014-12-10 |
| JP5316823B2 (en) | 2013-10-16 |
| WO2011030640A1 (en) | 2011-03-17 |
| JPWO2011030640A1 (en) | 2013-02-04 |
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